Hot water heater



April 23, 1935. H, 5, Dow 1,999,037

HOT WATER HEATER Filed May '25, 1953 mvcn'rna fiziawwa Patente cl- Apr.23, 1935; I i p I I um'rsof "STAT' 'ES' PATENT fort es.

1 it Henry S. Dodd, Toronto, Ontario, Canada, as-

. signor to Canadian Chrornalox Company Lim-' ited, Toronto, Ontario,Canada Application May 25, 1933, Serial No. 672,829 I 7 Claims. (01.219-38 i *This invention relates to heaters of the electric and 6, maybe removed through the upper end type, in which a boiler has one or morevertically of the tank. arranged tubes extending therethrough, in whichWithinthe tubes 8 are locatedthe heating eletubes are positioned heatingelements packed in ments. The heating elements employed may be t '5 sand'or other powdery material. The leads for of various types, but Ipreferably employ a the element are usually connected at the top. Insheathed element 9 in which theresistance is imuse the elementexpandsand contracts, as it is bedded in a powdered refractory material com.-he'ate'dup and cools. The result is that as the 'pacted under pressure.As the elements 9 do I element contracts or shortens, the sandor othernot fill the tubes 8, and to prevent the elements 10 packing materialslides in below the 'element,confrom damage through Warping, the tubes 8about 10 sequently when the element is again heated, the the elementsare filled with powdered Lmaterial expansion must all take place in theupward di- 9, pre a y What is Commercially known as rection on accountof the difliculty in working silver sand. The lower ends of the tubesare down into the packing which has slid down below p v ded w t pw c inthe d w a e the element. This sequence is followed over shown asreducing couplings, the bottoms being 15 and over, and each time theelement cools and closed by plugs 52. t I contracts, more and morepacking slides downbe- As stated in the preamble of the specification,low it with the result in time the element reaches it is desired toprevent the upward creeping of the top of the tube, and either forcesoff the cap the elements 9 due to expansion and contraction,

or causes a bending and breaking down of the and I therefore providemeans for anchoring the 20 element. I elements 9.

My object therefore, is to devise a construction The anchoring meanscomprises a hook memwhich will prevent this upward creeping of the herIS, the hook of which extends through a hole' element, and I attain myobject by means of the in the end of the element casing and has a nut2.3 constructions hereinafter described and illus- I1 set up thereon.The stem of the hook memtrated'in the accompanying drawing in which herextends through a hole in the plug l2, and Fig. 1 is a vertical sectionof a water heater has a nut 18 above the plug and a nut i9 belowconstructed in accordance with my invention; the plug to lock the hookmember in position.

Fig. 2 a cross section through the same; and The element casing stopsshort of the upper end so Fig. 3 a detail on anenlarged scale of theeleof the tube so that it is free to expand upwardly 3o 'ment anchoringmeans. in the powdered filling.

In the drawing like numerals of reference in- In the event of abreakdownin an individual clicatecorrespondingparts in the different figelement,the nut I9 is first removed, then the ures. plug l2, which allows thepowdered material to 3 I is a cylindrical casing having an inwardlyescape, and the element may then be removed directed flange 2 at itsupper end and an inwardly through the upper end of the tube. The plug l2directed flange 3 at its bottom, the lower flange will then be replaced,a new element placed in being of greater width than the upper flange.position and anchored by screwing on the nut I9,

. v To the upper flange 2 is secured outside the and the tube againfilled with powdered material.

40 tank the upper closure member 4 by means of The heater may beprovided with sleeves I3 40 studs or bolts 5. To the lower flange 3, bystuds encasing the tubes 8 for the purpose of causing a or bolts 6, issecured within the tank the closure circulation within the tank. Tofacilitate re- 7 member I, which closure member is of a size to moval,the sleeves may be formed in two halves permit its withdrawal throughthe top of the secured together by screws I4 or the like and will tankwhen the closure member 4 is removed. besupported on brackets 15 mountedon the sides am Suitable packing will be interposed between the of thetubes 8. With this arrangement, when the closure members and flanges tomake the joints elements are in use, the water as heated, tendswatertight. to travel upwardly between the tubes and sleeves,

The closure members 4 and I are provided with the coldwater movingdownwardly outside the v a plurality of alined holes and in these holesare sleeves. I V a positioned tubes 8. Three are shown in the What Iclaim as my invention is:

drawing although any desired number may be 1. In an electric heater, thecombination of "a.

employed. The closure members 4 and I and the vertically arrangedtubular member; a sheathed tubes 8 are secured together to form aunitary heating element within the tubular member; a

construction, which, after removing the studs 5 closure for the lowerend of said tubular member;

and pulverized material surrounding said element within the tubularmember, said heating element having the lower end of its sheath anchoredto prevent upward movement, and its upper end free to expand upwardly.

2. In an electric heater, the combination of a vertically arrangedtubular member; a sheathed heating element within the tubular member; aclosure for the lower end of said tubular memher; and pulverizedmaterial surrounding said element within the tubular member, saidheating element having the lower end of its sheath anchored to saidclosure to prevent upward movement, and its upper end free to expandupwardly.

3. In an electric heater, the combination of a vertically arrangedtubular member; a sheathed heating element within the tubular member; aremovable closure for the lower end of said tubular member; andpulverized material surrounding said element within the tubular member,said heating element having the lower end of its sheath anchored toprevent upward movement, and its upper end free to expand upwardly.

4. In an electric heater, the combination of a vertically arrangedtubular member; a sheathed heating element within the tubular member; aremovable closure for the lower end of said tubular member; andpulverized material surrounding said element within the tubular member,said heating element having the lower end of its sheath anchored to saidclosure to prevent upward movement, and its upper end free to expandupwardly.

5. In an electric heater, the combination of a vertically arrangedtubular member; a sheathed heating element within the tubular member; aclosure for the lower end of said tubular member, said closure having ahole formed therethrough; pulverized material surrounding said elementwithin the tubular member; a hook member having its hooked end engagingthe lower end of the sheath said element and its stem extending throughsaid closure; and a nut on said stem below the closure, and its upperend free to expand upwardly.

6. In an electric heater, the combination of a vertically arrangedtubular member; a sheathed heating element within the tubular member; aclosure for the lower end of said tubular member, said closure having ahole formed therethrough; pulverized material surrounding said elementwithin the tubular member; a hook member having its hooked end engagingthe lower end of the sheath said element and its stem extending throughsaid closure; a nut on said stem below the closure; and a nut on saidstem above the closure, and its upper end free to expand upwardly.

7. In an electric water heater, the combination of a casing; a tubularmember within the casing and having its ends extending through the topand bottom thereof; a sheathed heating element within the tubularmember; a closure for the lower end of said tubular member; andpulverized material surrounding said element within the tubular member,said heating element having the lower end of its sheath anchored toprevent upward movement, and its upper end free to expand upwardly.

H. S. DODD.

